U.S. patent application number 14/428905 was filed with the patent office on 2015-08-06 for method and device for sending signals and configuration information and finding terminals.
This patent application is currently assigned to China Academy of Telecommunications Technology. The applicant listed for this patent is CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY. Invention is credited to Bin Jiao, Jiamin Liu, Fangli Xu.
Application Number | 20150222401 14/428905 |
Document ID | / |
Family ID | 50322706 |
Filed Date | 2015-08-06 |
United States Patent
Application |
20150222401 |
Kind Code |
A1 |
Xu; Fangli ; et al. |
August 6, 2015 |
METHOD AND DEVICE FOR SENDING SIGNALS AND CONFIGURATION INFORMATION
AND FINDING TERMINALS
Abstract
A method and device for sending signals and configuration
information and finding terminals, which relate to the field of
wireless communications and are used for solving the problem of how
terminals find each other. In the present invention, a first
terminal sends a D2D signal according to sending resource
configuration information about the D2D signal acquired from a
network side, and a second terminal searches for the D2D signal
according to receiving resource configuration information about the
D2D signal acquired from the network side and determines that the
corresponding first terminal is found when finding the D2D signal.
It can be seen that the present solution solves the problem of how
terminals find each other.
Inventors: |
Xu; Fangli; (Beijing,
CN) ; Jiao; Bin; (Beijing, CN) ; Liu;
Jiamin; (Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
Beijing |
|
CN |
|
|
Assignee: |
China Academy of Telecommunications
Technology
Haidian District, Beijing
CN
|
Family ID: |
50322706 |
Appl. No.: |
14/428905 |
Filed: |
July 30, 2013 |
PCT Filed: |
July 30, 2013 |
PCT NO: |
PCT/CN2013/080448 |
371 Date: |
March 17, 2015 |
Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04L 41/0806 20130101;
H04W 76/14 20180201; H04L 5/0048 20130101; H04W 76/27 20180201;
H04W 72/0406 20130101; H04W 8/005 20130101; H04W 88/08 20130101;
H04W 88/02 20130101 |
International
Class: |
H04L 5/00 20060101
H04L005/00; H04W 72/04 20060101 H04W072/04; H04L 12/24 20060101
H04L012/24; H04W 8/00 20060101 H04W008/00; H04W 76/04 20060101
H04W076/04; H04W 76/02 20060101 H04W076/02 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 18, 2012 |
CN |
201210348269.X |
Claims
1. A method for transmitting a signal, wherein the method
comprises: obtaining, by a first UE, transmission resource
configuration information of a Device to Device (D2D) signal from a
network side after establishing a Radio Resource Control (RRC)
connection with the network side; and transmitting, by the first
UE, the D2D signal according to the transmission resource
configuration information.
2. The method according to claim 1, wherein obtaining transmission
resource configuration information of a D2D signal from the network
side comprises: receiving, by the first UE, the transmission
resource configuration information, of a D2D signal, transmitted by
the network side in dedicated signaling; or transmitting, by the
first UE, a D2D signal transmission request to the network side and
receiving the transmission resource configuration information, of a
D2D signal, transmitted by the network side in dedicated
signaling.
3. The method according to claim 1, wherein transmitting, by the
first UE, the D2D signal according to the transmission resource
configuration information comprises: generating, by the first UE, a
D2D signal to be transmitted and transmitting the generated D2D
signal according to the transmission resource configuration
information; or receiving, by the first UE, a D2D signal
transmitted in advance by the network side and transmitting the
received D2D signal according to the transmission resource
configuration information.
4. The method according to claim 3, wherein the D2D signal
comprises: a specific sequence of an air interface and/or a D2D
special identifier of the first UE; wherein the D2D special
identifier comprises identity information of the first UE and/or
service information provided by the first UE.
5. (canceled)
6. The method according to claim 1, wherein after the first UE
obtains the transmission resource configuration information of a
D2D signal from the network side, and before the first UE transmits
the D2D signal according to the transmission resource configuration
information, the method further comprises: releasing, by the first
UE, an RRC connection with the network side.
7. The method according to claim 1, wherein after the first UE
transmits the D2D signal according to the transmission resource
configuration information, the method further comprises: releasing,
by the first UE, resources over which the D2D signal is
transmitted.
8. The method according to claim 7, wherein releasing, by the first
UE, the resources over which the D2D signal is transmitted
comprises: releasing, by the first UE, the resources over which a
D2D signal is transmitted, upon reception of a D2D resource release
instruction or an RRC connection release instruction transmitted by
the network side; or transmitting, by the first UE, a request to
the network side to stop the D2D signal from being transmitted and
releasing the resources, over which a D2D signal is transmitted,
upon reception of a D2D resource release instruction or an RRC
connection release instruction transmitted by the network side; or
releasing, by the first UE, the resources, over which a D2D signal
is transmitted, after a period of time T elapses since the
transmission resource configuration information is received,
wherein T represents the length of valid time of the configuration
information comprised in the transmission resource configuration
information.
9. (canceled)
10. The method according to claim 1, wherein the method further
comprises: if the first UE is switched to a new cell during
transmitting a D2D signal and the first UE is idle or connected
while transmitting the D2D signal, then judging, by the first UE,
whether the new cell belongs to a valid area, where the obtained
transmission resource configuration information is applicable,
after being switched to the new cell, and if so, then continuing
with transmitting the D2D signal according to the transmission
resource configuration information; otherwise, stopping the D2D
signal from being transmitted; or if the first UE is switched to a
new cell during transmitting a D2D signal and first UE is connected
while transmitting the D2D signal, then continuing, by the first
UE, with transmitting the D2D signal according to new transmission
resource configuration information carried in a handover command
received in the handover procedure after being switched to the new
cell.
11. The method according to claim 1, wherein the transmission
resource configuration information comprises at least one of:
transmission resource location information, a transmit power
parameter, a transmission period parameter, a parameter of a number
of retransmissions, modulation and coding parameters, and valid
range information of configuration information.
12. A method for discovering a UE, wherein the method comprises:
obtaining, by a second UE, reception resource configuration
information of a Device to Device (D2D) signal from a network side;
and searching, by the second UE, for a D2D signal according to the
reception resource configuration information and determining a
discovery of a first UE transmitting the D2D signal upon detection
of the D2D signal.
13. The method according to claim 12, wherein obtaining, by the
second UE, the reception resource configuration information of a
D2D signal from the network side comprises: transmitting, by the
second UE, a D2D signal reception request to the network side and
receiving the reception resource configuration information, of a
D2D signal, transmitted by the network side in dedicated signaling;
or fetching, by the second UE, the reception resource configuration
information of a D2D signal from a system broadcast message
transmitted by the network side.
14. (canceled)
15. The method according to claim 12, wherein after the discovery
of the first UE transmitting the D2D signal is determined, the
method further comprises: releasing, by the second UE, resources
over which a D2D signal is received.
16. The method according to claim 15, wherein releasing, by the
second UE, the resources over which a D2D signal is received
comprises: releasing, by the second UE, the resources over which a
D2D signal is received, upon reception of a D2D resource release
instruction or an RRC connection release instruction transmitted by
the network side in dedicated signaling; or transmitting, by the
second UE, a request to the network side to stop the D2D signal
from being received and releasing the resources, over which a D2D
signal is received, upon reception of a D2D resource release
instruction or an RRC connection release instruction transmitted by
the network side in dedicated signaling; or releasing, by the
second UE, the resources over which a D2D signal is received, upon
detecting no reception resource configuration information carried
in a system broadcast message; or releasing, by the second UE, the
resources over which a D2D signal is received, after a period of
time T since the reception resource configuration information is
received, wherein T represents the length of valid time of the
configuration information comprised in the reception resource
configuration information.
17. The method according to claim 12, wherein a set of resources,
over which a D2D signal is received, indicated by the reception
resource configuration information, is a set of resources, over
which a D2D signal is transmitted, allocated by the network side or
a subset thereof.
18. The method according to claim 12, wherein the reception
resource configuration information comprises at least one of:
reception resource location information, modulation and coding
parameters, and valid range information of configuration
information.
19. A method for transmitting configuration information, wherein
the method comprises: transmitting, by a network side, transmission
resource configuration information of a Device to Device (D2D)
signal to a first UE after the first UE establishes a Radio
Resource Control (RRC) connection with the network side, so that
the first UE transmits the D2D signal according to the transmission
resource configuration information; and transmitting, by the
network side, reception resource configuration information of a D2D
signal to a second UE, so that the second UE searches for a D2D
signal transmitted by the first UE according to the reception
resource configuration information.
20-22. (canceled)
23. The method according to claim 19, wherein after the network
side transmits the transmission resource configuration information
of a D2D signal to the first UE, the method further comprises: if
the first UE is switched to a new cell and the first UE is
currently connected, then transmitting new transmission resource
configuration information to the first UE in a handover command in
the handover procedure of the first UE, so that the first UE
continues with transmitting the D2D signal according to the new
transmission resource configuration information.
24-56. (canceled)
57. A UE, comprising a transceiver, a processor and a memory,
wherein: the processor is configured to obtain transmission
resource configuration information of a Device to Device (D2D)
signal from a network side through the transceiver after the UE
establishes a Radio Resource Control (RRC) connection with the
network side; to store the transmission resource configuration
information of a D2D signal in the memory; and to transmit a D2D
signal through the transceiver according to the transmission
resource configuration information stored in the memory.
58-66. (canceled)
67. A UE, comprising a transceiver, a processor and a memory,
wherein: the processor is configured to obtain reception resource
configuration information of a Device to Device (D2D) signal from a
network side through the transceiver; to store the obtained
reception resource configuration information in the memory; and to
search for a D2D signal through the transceiver according to the
reception resource configuration information stored in the memory
and to determine a discovery of a first UE transmitting the D2D
signal upon detection of the D2D signal.
68-73. (canceled)
74. A base station, comprising a transceiver and a processor,
wherein: the processor is configured to transmit transmission
resource configuration information of a Device to Device (D2D)
signal to a first UE through the transceiver after the first UE
establishes an Radio Resource Connection (RRC) connection with the
network side, so that the first UE transmits a D2D signal according
to the transmission resource configuration information; and to
transmit reception resource configuration information of a D2D
signal to a second UE through the transceiver, so that the second
UE searches for a D2D signal transmitted by the first UE according
to the reception resource configuration information.
75-83. (canceled)
Description
[0001] This application claims the benefit of Chinese Patent
Application No. 201210348269.X, filed with the Chinese Patent
Office on Sep. 18, 2012 and entitled "Methods and devices for
transmitting signal and for transmitting configuration information
and for discovering UE", which is hereby incorporated by reference
in its entirety.
FIELD
[0002] The present invention relates to the field of wireless
communications and particularly to a method and device for
transmitting a signal, a method and device for transmitting
configuration information, and a method and device for discovering
a UE.
BACKGROUND
[0003] As illustrated in FIG. 1, such a network centralized control
approach is adopted in a Long Term Evolution (LTE) system that both
uplink and downlink data of a User Equipment (UE) is controlled by
the network to be transmitted and received. Communication between
one UE and another UE is forwarded and controlled by the network.
There is no direct communication link between the UE and the other
UE, and UE is not allowed to transmit uplink data by itself.
[0004] As can be apparent, there has been absent in the prior art a
mechanism to discover each other between the UEs, and even
communicate directly between the UEs.
SUMMARY
[0005] Embodiments of the invention provide a method and device for
transmitting a signal, a method and device for transmitting
configuration information, and a method and device for discovering
a UE so as to address the problem of how to discover each other
between UEs.
[0006] A method for transmitting a signal includes:
[0007] obtaining, by a first UE, transmission resource
configuration information of a Device to Device (D2D) signal from a
network side after establishing a Radio Resource Control (RRC)
connection with the network side; and
[0008] transmitting, by the first UE, the D2D signal according to
the transmission resource configuration information.
[0009] A method for discovering a UE includes:
[0010] obtaining, by a second UE, reception resource configuration
information of a Device to Device (D2D) signal from a network side;
and
[0011] searching, by the second UE, for a D2D signal according to
the reception resource configuration information and determining a
discovery of a first UE transmitting the D2D signal upon detection
of the D2D signal.
[0012] A method for transmitting configuration information
includes:
[0013] transmitting, by a network side, transmission resource
configuration information of a Device to Device (D2D) signal to a
first UE after the first UE establishes a Radio Resource Control
(RRC) connection with the network side, so that the first UE
transmits the D2D signal according to the transmission resource
configuration information; and
[0014] transmitting, by the network side, reception resource
configuration information of a D2D signal to a second UE, so that
the second UE searches for a D2D signal transmitted by the first UE
according to the reception resource configuration information.
[0015] A UE includes:
[0016] a configuration information obtaining unit configured to
obtain transmission resource configuration information of a Device
to Device (D2D) signal from a network side after a Radio Resource
Control (RRC) connection is established with the network side;
and
[0017] a D2D signal transmitting unit configured to transmit the
D2D signal according to the transmission resource configuration
information.
[0018] A UE includes:
[0019] a configuration information obtaining unit configured to
obtain reception resource configuration information of a Device to
Device (D2D) signal from a network side; and
[0020] a D2D signal searching unit configured to search for a D2D
signal according to the reception resource configuration
information and to determine a discovery of a first UE transmitting
the D2D signal upon detection of the D2D signal.
[0021] A base station includes:
[0022] a first configuring unit configured to transmit transmission
resource configuration information of a Device to Device (D2D)
signal to a first UE after the first UE establishes a Radio
Resource Control (RRC) connection with the network side, so that
the first UE transmits a D2D signal according to the transmission
resource configuration information; and
[0023] a second configuring unit configured to transmit reception
resource configuration information of a D2D signal to a second UE,
so that the second UE searches for a D2D signal transmitted by the
first UE according to the reception resource configuration
information.
[0024] Another UE includes a transceiver, a processor and a memory,
wherein:
[0025] the processor is configured to obtain transmission resource
configuration information of a Device to Device (D2D) signal from a
network side through the transceiver after the UE establishes a
Radio Resource Control (RRC) connection with the network side; to
store the transmission resource configuration information of a D2D
signal in the memory; and to transmit a D2D signal through the
transceiver according to the transmission resource configuration
information stored in the memory.
[0026] Another UE includes a transceiver, a processor and a memory,
wherein:
[0027] the processor is configured to obtain reception resource
configuration information of a Device to Device (D2D) signal from a
network side through the transceiver; to store the obtained
reception resource configuration information in the memory; and to
search for a D2D signal through the transceiver according to the
reception resource configuration information stored in the memory
and to determine a discovery of a first UE transmitting the D2D
signal upon detection of the D2D signal.
[0028] Another base station includes a transceiver and a processor,
wherein:
[0029] the processor is configured to transmit transmission
resource configuration information of a Device to Device (D2D)
signal to a first UE through the transceiver after the first UE
establishes an Radio Resource Connection (RRC) connection with the
network side, so that the first UE transmits a D2D signal according
to the transmission resource configuration information; and to
transmit reception resource configuration information of a D2D
signal to a second UE through the transceiver, so that the second
UE searches for a D2D signal transmitted by the first UE according
to the reception resource configuration information.
[0030] In the solution according to the embodiments of the
invention, the first UE transmits a D2D signal according to the
transmission resource configuration information, of a D2D signal,
obtained from the network side, and the second UE searches for a
D2D signal according to the reception resource information, of a
D2D signal, obtained from the network side and determines a
discovery of the corresponding first UE upon detection of the D2D
signal. As can be apparent, in this solution, a UE to be
discovered, i.e., the first UE, transmits a D2D signal, a UE
needing to discover another UE, i.e., the second UE, discovers the
first UE by searching for a D2D signal, which addresses the problem
of how to discover each other between the UEs.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] FIG. 1 illustrates a schematic diagram of uplink and
downlink data transmission in the LTE system in the prior art;
[0032] FIG. 2 illustrates a schematic diagram of a D2D
communication mode according to an embodiment of the invention;
[0033] FIG. 3 illustrates a schematic flow chart of a method
according to an embodiment of the invention;
[0034] FIG. 4 illustrates a schematic flow chart of a method
according to another embodiment of the invention;
[0035] FIG. 5 illustrates a schematic flow chart of a method
according to a further embodiment of the invention;
[0036] FIG. 6a illustrates a schematic flow chart according to a
first embodiment of the invention;
[0037] FIG. 6b illustrates a schematic flow chart according to a
second embodiment of the invention;
[0038] FIG. 6c illustrates a schematic flow chart according to a
third embodiment of the invention;
[0039] FIG. 6d illustrates a schematic flow chart according to a
fourth embodiment of the invention;
[0040] FIG. 6e illustrates a schematic flow chart in a first
approach according to a fifth embodiment of the invention;
[0041] FIG. 6f illustrates a schematic flow chart in a second
approach according to the fifth embodiment of the invention;
[0042] FIG. 6g illustrates a schematic flow chart in a first
approach according to a sixth embodiment of the invention;
[0043] FIG. 6h illustrates a schematic flow chart in a second
approach according to the sixth embodiment of the invention;
[0044] FIG. 6i illustrates a schematic flow chart in a third
approach according to the sixth embodiment of the invention;
[0045] FIG. 6j illustrates a schematic flow chart in a fourth
approach according to the sixth embodiment of the invention;
[0046] FIG. 6k illustrates a schematic flow chart according to a
seventh embodiment of the invention;
[0047] FIG. 7 illustrates a schematic structural diagram of a UE
according to an embodiment of the invention;
[0048] FIG. 8 illustrates a schematic structural diagram of another
UE according to an embodiment of the invention;
[0049] FIG. 9 illustrates a schematic structural diagram of a base
station according to an embodiment of the invention;
[0050] FIG. 10 illustrates a schematic structural diagram of
another UE according to an embodiment of the invention;
[0051] FIG. 11 illustrates a schematic structural diagram of
another UE according to an embodiment of the invention; and
[0052] FIG. 12 illustrates a schematic structural diagram of
another base station according to an embodiment of the
invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0053] A mechanism to discover each other between mobile devices,
and even communicate directly between mobile devices will be
introduced in future development of a mobile communication, in
order to better satisfy a user demand and improve the efficiency of
exchanging information.
[0054] As illustrated in FIG. 2, some direction communication is
allowed between one UE and another UE in a Device to Device (D2D)
communication mode, such direct communication links can be
established under the control or assistance by a network. D2D
communication between the UE and the other UE is performed based on
discovery of a proximate UE.
[0055] In order to address the problem of how to discover each
other between the UEs, embodiments of the invention provide a
method for transmitting a signal and a method for discovering a UE.
In these methods, a first UE transmits a D2D signal according to
transmission resource configuration information, of a D2D signal,
obtained from the network side, and a second UE searches for a D2D
signal according to reception resource configuration information,
of a D2D signal, obtained from the network side and determines a
discovery of the corresponding first UE upon detection of the D2D
signal.
[0056] Referring to FIG. 3, a method for transmitting a signal
according to an embodiment of the invention includes the following
operations:
[0057] Operation 30, a first UE obtains transmission resource
configuration information of a D2D signal from the network side
after establishing a Radio Resource Control (RRC) connection with
the network side, and the transmission resource configuration
information is information related to transmission of a D2D signal;
and
[0058] Operation 31, the first UE transmits a D2D signal according
to the transmission resource configuration information.
[0059] Particularly in the operation 30, the first UE can obtain
the transmission resource configuration information of a D2D signal
from the network side in one of the following two scenarios:
[0060] First scenario, the first UE receives the transmission
resource configuration information, of a D2D signal, transmitted by
the network side (e.g., an eNB) actively in dedicated signaling,
the dedicated signaling can be RRC dedicated signaling or Media
Access Control (MAC) layer control signaling or physical layer
control signaling.
[0061] Second scenario, the first UE transmits a D2D signal
transmission request to the network side and receives the
transmission resource configuration information, of a D2D signal,
transmitted by the network side in dedicated signaling.
[0062] Particularly the transmission resource configuration
information obtained by the first UE can include at least one of:
transmission resource location information, a transmit power
parameter, a transmission period parameter, a parameter of a number
of retransmissions, modulation and coding parameters, and valid
range information of configuration information. The transmission
resource location information is information indicating resource
locations at which a D2D signal is transmitted, including frequency
resource location information and/or time resource location
information, and if the transmission resource configuration
information includes no transmission resource location information,
then the first UE can transmit a D2D signal at resource locations
predefined with the network side; the transmit power parameter is a
parameter related to power at which a D2D signal is transmitted,
e.g., maximum transmit power, etc., and if the transmission
resource configuration information includes no transmit power
parameter, then the first UE can transmit a D2D signal at a
transmit power predefined with the network side; the transmission
period parameter is a parameter related to a time period at which a
D2D signal is transmitted, e.g., the shortest time period, etc.,
and if the transmission resource configuration information includes
no transmission period parameter, then the first UE can transmit a
D2D signal at a transmit period predefined with the network side;
the parameter of the number of retransmissions is a parameter
indicating the number of times that a D2D signal is retransmitted
so that the success ratio, at which the D2D signal can be
discovered by another UE, can be guaranteed, and if the
transmission resource configuration information includes no
parameter of the number of retransmissions, then the first UE can
transmit a D2D signal at the number of retransmissions predefined
with the network side; the modulation and coding parameters are
parameters used to modulate and encode the transmitted D2D signal,
including a Modulation and Coding Scheme (MCS), etc., and if the
transmission resource configuration information includes no
modulation and coding parameters, then the first UE can modulate
and encode the transmitted D2D signal according to modulation and
coding parameters predefined with the network side; and the valid
range information of the configuration information is information
indicating a valid range in which the current transmission resource
configuration information is applicable, including valid area
information and/or valid time and other information about the
configuration information, and if the transmission resource
configuration information includes no valid range information of
configuration information, then the first UE can determine a valid
range of the current transmission resource configuration
information according to valid range information predefined with
the network side.
[0063] Particularly in the operation 31, the first UE can transmit
a D2D signal according to the transmission resource configuration
information in one of the following two approaches:
[0064] First approach, the first UE generates a D2D signal to be
transmitted and transmits the generated D2D signal according to the
obtained transmission resource configuration information; and
[0065] Second approach, the first UE receives a D2D signal
transmitted by the network side and transmits the received D2D
signal according to the obtained transmission resource
configuration information.
[0066] Particularly the D2D signal transmitted by the first UE can
include a specific sequence of an air interface and/or a D2D
special identifier of the first UE. Preferably the D2D special
identifier can include identity information of the first UE and/or
service information provided by the first UE. The first UE can
transmit the D2D signal in a specific coding scheme or format. Here
the specific sequence is a pre-designed sequence including 0 and 1
arranged in a specific order. The specific coding scheme or format
can particularly be a 1/3-rate turbo coding scheme, etc.
[0067] Furthermore after the first UE obtains the transmission
resource configuration information of a D2D signal from the network
side, and before the first UE transmits the D2D signal according to
the transmission resource configuration information, the first UE
can release an RRC connection with the network side.
[0068] Preferably after the first UE transmits the D2D signal
according to the transmission resource configuration information,
the first UE can release the resources over which a D2D signal is
transmitted, particularly in one of the following three
scenarios:
[0069] First scenario, the first UE releases the resources over
which a D2D signal is transmitted upon reception of a D2D resource
release instruction transmitted actively by the network side; and
here before the network side transmits actively the D2D resource
release instruction, if the first UE is idle, then the network side
needs to initiate an RRC connection setup procedure with the first
UE; or
[0070] The first UE releases the resources over which a D2D signal
is transmitted upon reception of an RRC connection release
instruction transmitted actively by the network side (which is
applicable to the first UE remaining connected all the time while
transmitting the D2D signal);
[0071] Second scenario, the first UE transmits a request to the
network side to stop the D2D signal from being transmitted and
releases the resources over which a D2D signal is transmitted upon
reception of a D2D resource release instruction or an RRC
connection release instruction transmitted by the network side; and
here before the first UE transmits the request to the network side
to stop the D2D signal from being transmitted, if the first UE is
idle, then the first UE needs to initiate an RRC connection setup
procedure with the network side; or
[0072] Third scenario, the first UE releases the resources over
which a D2D signal is transmitted after a period of time T elapses
since the transmission resource configuration information is
received, T represents the length of the valid time of the
configuration information included in the transmission resource
configuration information.
[0073] Preferably if the first UE is switched to a new cell during
transmitting a D2D signal and the first UE is idle or connected
while transmitting the D2D signal, then the first UE judges whether
the new cell belongs to the valid area where the obtained
transmission resource configuration information is applicable,
after being switched to the new cell, and if so, then the first UE
continues with transmitting a D2D signal according to the
transmission resource configuration information; otherwise, the
first UE stops the D2D signal from being transmitted. Here the
first UE can judge whether the new cell belongs to the valid area,
where the obtained transmission resource configuration information
is applicable, according to the valid area information of the
configuration information in the transmission resource
configuration information; and of course, when the transmission
resource configuration information includes no valid area
information of the configuration information, the first UE can
judge whether the new cell belongs to the valid area, where the
obtained transmission resource configuration information is
applicable, according to preconfigured valid area information;
or
[0074] If the first UE is switched to a new cell during
transmitting a D2D signal and the first UE is connected while
transmitting the D2D signal, then the first UE continues with
transmitting a D2D signal according to new transmission resource
configuration information carried in a handover command received in
the handover procedure after being switched to the new cell.
[0075] Furthermore after the first UE stops transmitting the D2D
signal, the first UE can transmit an indicator to the network side
to indicate stopping transmission of the D2D signal, and first UE
release the resources, over which a D2D signal is transmitted, upon
reception of the D2D resource release instruction or the RRC
connection release instruction transmitted by the network side.
[0076] Referring to FIG. 4, a method for discovering a UE according
to an embodiment of the invention includes the following
operations:
[0077] Operation 40, a second UE obtains reception resource
configuration information of a D2D signal from the network side,
the reception resource configuration information is information
related to reception of a D2D signal; and
[0078] Operation 41, the second UE searches for a D2D signal
according to the reception resource configuration information and
determines a discovery of a first UE transmitting the D2D signal
upon detection of the D2D signal. Here the second UE can determine
the discovery of the first UE transmitting the D2D signal upon
detection of the D2D signal as follows: if the D2D signal includes
a specific sequence of an air interface, then the second UE can
determine a UE corresponding to the specific sequence in the
detected D2D signal according to a pre-stored correspondence
relationship between the sequence of the air interface and the UE,
the determined UE is the first UE transmitting the D2D signal; and
if the D2D signal includes a D2D special identifier of the first
UE, then the second UE can determine that a UE corresponding to the
D2D special identifier is the first UE transmitting the D2D
signal.
[0079] Particularly the second UE can obtain the reception resource
configuration information of a D2D signal from the network side as
follows:
[0080] First, the second UE transmits a D2D signal reception
request to the network side and receives the reception resource
configuration information, of a D2D signal, transmitted by the
network side in dedicated signaling; or
[0081] Second, the second UE fetches the reception resource
configuration information of a D2D signal from a system broadcast
message transmitted by the network side.
[0082] Particularly the reception resource configuration
information can include at least one of: reception resource
location information, modulation and coding parameters, and the
valid range information of configuration information. The reception
resource location information is information indicating resource
locations at which a D2D signal is searched for, including
frequency resource location information and/or time resource
location information, and if the reception resource configuration
information includes no reception resource location information,
then the second UE can search for a D2D signal at resource
locations predefined with the network side; the modulation and
coding parameters are parameters used by the first UE transmitting
the D2D signal to modulate and encode the D2D signal, including an
MCS, etc., and the second UE demodulates and decodes the detected
D2D signal according to the modulation and coding parameters, and
if the reception resource configuration information includes no
modulation and coding parameters, then the second UE can demodulate
and decode the detected D2D signal according to modulation and
coding parameters predefined with the network side; and the valid
range information of the configuration information is information
indicating a valid range in which the current reception resource
configuration information is applicable, including valid area
information and/or valid time and other information about the
configuration information, and if the reception resource
configuration information includes no valid range information of
configuration information, then the second UE can determine a valid
range of the current reception resource configuration information
according to valid range information predefined with the network
side.
[0083] Preferably the second UE fetches related information of the
first UE from the detected D2D signal, and/or the second UE
transmits an indicator about the detection of the D2D signal of the
first UE to the network side, upon determining the discovery of the
first UE which transmits the D2D signal. The related information of
the first UE includes a D2D special identifier, etc., of the UE,
and the D2D special identifier can include identity information of
the first UE and/or service information provided by the first
UE.
[0084] Preferably the second UE can release the resources over
which a D2D signal is received upon determining the discovery of
the first UE which transmits the D2D signal.
[0085] Particularly the second UE can release the resources over
which a D2D signal is received in one of the following
scenarios:
[0086] First scenario, the second UE releases the resources over
which a D2D signal is received upon reception of a D2D resource
release instruction or an RRC connection release instruction
transmitted by the network side actively in dedicated
signaling;
[0087] Second scenario, the second UE transmits a request to the
network side to stop the D2D signal from being received, and
releases the resources over which a D2D signal is received upon
reception of a D2D resource release instruction or an RRC
connection release instruction transmitted by the network side in
dedicated signaling;
[0088] Third scenario, the second UE releases the resources over
which a D2D signal is received upon detecting no reception resource
configuration information carried in a system broadcast message;
and
[0089] Fourth scenario, the second UE releases the resources, over
which a D2D signal is received, after a period of time T since the
reception resource configuration information is received, T
represents the length of a valid time period of the configuration
information included in the reception resource configuration
information.
[0090] In this method, in order to enable the second UE to detect
accurately a D2D signal transmitted by the first UE, a set of
resources over which the second UE receives a D2D signal is a set
of resources, over which a D2D signal is transmitted (i.e.,
resources over which the first UE transmits a D2D signal),
allocated by the network side or a subset thereof. Thus the set of
resources, over which a D2D signal is received, indicated by the
reception resource configuration information, is a set of
resources, over which a D2D signal is transmitted, allocated by the
network side or a subset thereof.
[0091] Referring to FIG. 5, a method for transmitting configuration
information according to an embodiment of the invention includes
the following operations:
[0092] Operation 50, the network side transmits transmission
resource configuration information of a D2D signal to a first UE
after the first UE establishes an RRC connection with the network
side, so that the first UE transmits a D2D signal according to the
transmission resource configuration information; and
[0093] Operation 51, the network side transmits reception resource
configuration information of a D2D signal to a second UE, so that
the second UE searches for a D2D signal transmitted by the first UE
according to the reception resource configuration information.
[0094] Particularly the network side can transmit the transmission
resource configuration information of a D2D signal to the first UE
as follows;
[0095] The network sides transmits actively the transmission
resource configuration information of a D2D signal to the first UE
in dedicated signaling; and
[0096] The network side transmits the transmission resource
configuration information of a D2D signal to the first UE in
dedicated signaling upon reception of a D2D signal transmission
request transmitted by the first UE.
[0097] Particularly the transmission resource configuration
information can include at least one of: transmission resource
location information, a transmit power parameter, a transmission
period parameter, a parameter of a number of retransmissions,
modulation and coding parameters, and the valid range information
of the configuration information.
[0098] Furthermore after transmitting the transmission resource
configuration information of a D2D signal to the first UE, the
network side further transmits to the first UE a D2D signal to be
transmitted by the first UE.
[0099] Preferably after the network side transmits the transmission
resource configuration information of a D2D signal to the first
UE,
[0100] The network side transmits actively a D2D resource release
instruction or an RRC connection release instruction to the first
UE to instruct the first UE to release resources over which a D2D
signal is transmitted; or
[0101] The network side transmits a D2D resource release
instruction or an RRC connection release instruction to the first
UE, upon reception of a request transmitted by the first UE to stop
the D2D signal from being transmitted, to instruct the first UE to
release resources over which a D2D signal is transmitted.
[0102] Preferably after the network side transmits the transmission
resource configuration information of a D2D signal to the first UE,
if the first UE is switched to a new cell and the first UE is
currently connected, then the network side transmits new
transmission resource configuration information to the first UE in
a handover command in the handover procedure of the first UE, so
that the first UE continues with transmitting a D2D signal
according to the new transmission resource configuration
information.
[0103] Particularly the network side can transmit the reception
resource configuration information of a D2D signal to the second UE
as follows:
[0104] The network side transmits the reception resource
configuration information of a D2D signal to the second UE in
dedicated signaling upon reception of a D2D signal reception
request transmitted by the second UE; or
[0105] The network side transmits the reception resource
configuration information of a D2D signal to the second UE in a
system broadcast message.
[0106] Particularly the reception resource configuration
information includes at least one of: reception resource location
information, modulation and coding parameters, and valid range
information of configuration information.
[0107] Preferably after the network side transmits the reception
resource configuration information of a D2D signal to the second
UE, the network side transmits actively a D2D resource release
instruction or an RRC connection release instruction to the second
UE in dedicated signaling, to instruct the second UE to release
resources over which a D2D signal is received; or
[0108] Upon reception of a request transmitted by the second UE to
stop the D2D signal from being received, the network side transmits
actively a D2D resource release instruction or an RRC connection
release instruction to the second UE in dedicated signaling to
instruct the second UE to release resources over which a D2D signal
is received.
[0109] In this method, a set of resources, over which a D2D signal
is received, indicated by the reception resource configuration
information, is a set of resources, over which a D2D signal is
transmitted, allocated by the network side or a subset thereof
[0110] The invention will be described below in connection with
particular embodiments thereof.
[0111] A UE transmitting a D2D signal will be referred to as a
Master Device (MD), and a UE searching for a D2D signal will be
referred to as a Slave Device (SD), in the following respective
embodiments.
First Embodiment
[0112] In this embodiment, when the MD transmits a D2D signal, the
MD has no RRC connection with the network side, as illustrated in
FIG. 6a:
[0113] Operation 0, an evolved Node B (eNB) transmits reception
resource configuration information of a D2D signal to the SD in a
system broadcast message, or dedicated signaling, etc., and the SD
obtains the reception resource configuration information of a D2D
signal in the system broadcast message, or the dedicated signaling,
etc.;
[0114] Operation 1, an RRC connection is established between MD and
the eNB;
[0115] Operation 2, the eNB transmits transmission resource
configuration information of a D2D signal to the MD in dedicated
signaling upon reception of a D2D signal transmission request
transmitted by the MD over the RRC connection;
[0116] Operation 3, the MD releases the RRC connection with the eNB
after obtaining the transmission resource configuration information
of a D2D signal;
[0117] Operation 4, the MD transmits a D2D signal, i.e., a pilot
signal, via an air interface according to the obtained transmission
resource configuration information;
[0118] Operation 5, the SD searches for a pilot signal according to
the reception resource configuration information of a D2D signal,
determines a discovery of the MD transmitting the pilot signal upon
detection of the pilot signal, and provides information carried by
the pilot signal to the application layer for use and
presentation;
[0119] Operation 6, the MD or the eNB initiates an RRC connection
setup procedure and an RRC connection is established between the MD
and the eNB;
[0120] Operation 7, the eNB transmits a D2D resource release
instruction to the MD to instruct the MD to release resources over
which a D2D signal is transmitted; and
[0121] Operation 8, the MD releases the resources over which a D2D
signal is transmitted and releases the RRC connection with the
eNB.
Second Embodiment
[0122] In this embodiment, when an MD transmits a D2D signal, the
MD remains an RRC connection with the network side, as illustrated
in FIG. 6b:
[0123] Operation 0, an eNB transmits reception resource
configuration information of a D2D signal to the SD in a system
broadcast message, or dedicated signaling, etc., and the SD obtains
the reception resource configuration information of a D2D signal in
the system broadcast message, or the dedicated signaling, etc.;
[0124] Operation 1, an RRC connection is established between the MD
and the eNB;
[0125] Operation 2, the eNB transmits transmission resource
configuration information of a D2D signal to the MD in dedicated
signaling upon reception of a D2D signal transmission request
transmitted by the MD over the RRC connection;
[0126] Operation 3, the MD transmits a D2D signal, i.e., a pilot
signal, via an air interface according to the obtained transmission
resource configuration information;
[0127] Operation 4, the SD searches for a pilot signal according to
the reception resource configuration information of a D2D signal,
determines a discovery of the MD transmitting the pilot signal upon
detection of the pilot signal, and provides information carried by
the pilot signal to the application layer for use and
presentation;
[0128] Operation 5, the eNB transmits a D2D resource release
instruction to the MD to instruct the MD to release resources over
which a D2D signal is transmitted; and
[0129] Operation 6, the MD releases the resources over which a D2D
signal is transmitted and releases the RRC connection with the
eNB.
Third Embodiment
[0130] In this embodiment, further based on the second embodiment,
when the MD transmits a D2D signal, there MD remains an RRC
connection with the network side, and the network side releases
resources of the MD, over which a D2D signal is transmitted, by
releasing the RRC connection thereof, as illustrated in FIG.
6c:
[0131] Operation 0, an eNB transmits reception resource
configuration information of a D2D signal to an SD in a system
broadcast message, or dedicated signaling, etc., and the SD obtains
the reception resource configuration information of a D2D signal in
the system broadcast message, or the dedicated signaling, etc.;
[0132] Operation 1, an RRC connection is established between the MD
and the eNB;
[0133] Operation 2, the eNB transmits transmission resource
configuration information of a D2D signal to the MD in dedicated
signaling upon reception of a D2D signal transmission request
transmitted by the MD over the RRC connection;
[0134] Operation 3, the MD transmits a D2D signal, i.e., a pilot
signal, via an air interface according to the obtained transmission
resource configuration information;
[0135] Operation 4, the SD searches for a pilot signal according to
the reception resource configuration information of a D2D signal,
determines a discovery of the MD transmitting the pilot signal upon
detection of the pilot signal, and provides information carried by
the pilot signal to the application layer for use and
presentation;
[0136] Operation 5, the eNB transmits an RRC connection release
instruction to the MD, and the MD releases its resources, over
which a D2D signal is transmitted, by releasing the RRC
connection.
Fourth Embodiment
[0137] In this embodiment, an MD transmits a D2D signal and related
data, and the MD is connected while transmitting the D2D signal and
the related data, as illustrated in FIG. 6d:
[0138] Operation 0, an eNB transmits reception resource
configuration information of a D2D signal to an SD in a system
broadcast message, or dedicated signaling, etc., and the SD obtains
the reception resource configuration information of a D2D signal in
the system broadcast message, or the dedicated signaling, etc.;
[0139] Operation 1, an RRC connection is established between the MD
and the eNB;
[0140] Operation 2, the eNB transmits transmission resource
configuration information of a D2D signal to the MD in dedicated
signaling upon reception of a D2D signal transmission request
transmitted by the MD over the RRC connection;
[0141] Operation 3, the MD transmits a D2D signal via an air
interface according to the obtained transmission resource
configuration information;
[0142] Operation 4, the MD transmits D2D data via the air interface
according to the obtained transmission resource configuration
information, the D2D signal enables the SD to discover the MD, and
the D2D data includes particular communication contents;
[0143] Operation 5, the SD searches for a D2D signal and D2D data
according to the reception resource configuration information of a
D2D signal, determines a discovery of the MD transmitting the D2D
signal and the D2D data upon detection of the D2D signal and the
D2D data, and provides the D2D data to the application layer for
use and presentation;
[0144] Operation 6, the eNB transmits a D2D resource release
instruction to the MD to instruct the MD to release resources over
which a D2D signal is transmitted; and
[0145] Operation 7, the MD releases the resources over which a D2D
signal is transmitted and releases the RRC connection with the
eNB.
Fifth Embodiment
[0146] In this embodiment, an SD can be configured with resources,
over which a D2D signal is received, particularly in the following
two approaches:
[0147] In a first approach, the resources are configured in RRC
dedicated signaling (when the SD searches for a D2D signal, the SD
can be idle or connected) as illustrated in FIG. 6e:
[0148] Operation 1, the SD transmits a D2D signal reception request
to an eNB when the SD has a need to receive a D2D signal; and
[0149] Operation 2, the eNB transmits reception resource
configuration information of a D2D signal, to be detected, to the
SD in dedicated signaling according to related information.
[0150] In a second approach, the resources are configured in a
system broadcast message, as illustrated in FIG. 6f:
[0151] The eNB broadcasts transmission resource configuration
information of a D2D signal, allocated in the current cell, in a
system broadcast message, and the SD fetches transmission resource
configuration information of a D2D signal from the system broadcast
message; and
[0152] When the SD has a need to receive a D2D signal, the SD
searches for a D2D signal according to the fetched transmission
resource configuration information of a D2D signal.
Sixth Embodiment
[0153] This embodiment describes a scheme of an SD to release
resources over which a D2D signal is received in the following four
approaches:
[0154] In a first approach, the resources are released in RRC
dedicated signaling as illustrated in FIG. 6g:
[0155] Operation 1, the SD transmits a request to an eNB to stop a
D2D signal from being received when the SD has no need to receive a
D2D signal; and
[0156] Operation 2, the eNB transmits a D2D resource release
instruction to the SD in RRC dedicated signaling to instruct the SD
to release resources over which a D2D signal is received.
[0157] In a second approach, resources over which a D2D signal is
received are released by releasing an RRC connection of UE as
illustrated in FIG. 6h:
[0158] Operation 1, the SD transmits a request to an eNB to stop a
D2D signal from being received when the SD has no need to receive a
D2D signal; and
[0159] Operation 2, the eNB transmits an RRC connection release
instruction to the SD to instruct the SD to release an RRC
connection.
[0160] In a third approach, the resources are released in a system
broadcast message as illustrated in FIG. 6i:
[0161] Operation 1, an eNB broadcasts configuration information of
resources, over which a D2D signal is received, allocated in the
current cell to the SD in a system broadcast message; and
[0162] Operation 2, the eNB stops broadcasting the configuration
information of the resources, over which a D2D signal is received,
in the system broadcast message when the D2D signal is stopped from
being transmitted in the cell.
[0163] In a fourth approach, the resources are released based upon
the length of a valid time period of configuration information
allocated for the SD, as illustrated in FIG. 6j:
[0164] The SD receives reception resource configuration information
of a D2D signal, including the length T of a valid time period of
the configuration information; and
[0165] The SD determines that the reception resource configuration
information is valid for the time period T since the configuration
information is received, that is, the SD searches for a D2D signal
according to the configuration information and releases actively
the resources, over which a D2D signal is received, after the time
period T expires.
Seventh Embodiment
[0166] In this embodiment, the SD notifies the network side upon
reception of a D2D signal transmitted by an MD as illustrated in
FIG. 6k:
[0167] Operation 1, an eNB transmits transmission resource
configuration information of a D2D signal to an MD in dedicated
signaling after an RRC connection is established between the MD and
the eNB;
[0168] Operation 2, the MD transmits a D2D signal via an air
interface according to the obtained transmission resource
configuration information;
[0169] Operation 3, the SD transmits a D2D signal reception request
to the eNB;
[0170] Operation 4, the eNB transmits reception resource
configuration information of a D2D signal to the SD in dedicated
signaling;
[0171] Operation 5, the SD searches for a D2D signal according to
the reception resource configuration information of a D2D signal,
determines a discovery of the MD transmitting the D2D signal upon
detection of the D2D signal, and provides the D2D data to the
application layer for use and presentation; and
[0172] Operation 6, the SD transmits an indicator of the detection
of the D2D signal transmitted by the MD to the eNB.
[0173] Referring to FIG. 7, a UE according to an embodiment of the
invention includes:
[0174] A configuration information obtaining unit 70 is configured
to obtain transmission resource configuration information of a
Device to Device (D2D) signal from the network side after a Radio
Resource Control (RRC) connection is established with the network
side; and
[0175] A D2D signal transmitting unit 71 is configured to transmit
a D2D signal according to the transmission resource configuration
information.
[0176] Furthermore the configuration information obtaining unit 70
is configured:
[0177] To receive the transmission resource configuration
information, of a D2D signal, transmitted by the network side in
dedicated signaling; or
[0178] To transmit a D2D signal transmission request to the network
side and to receive the transmission resource configuration
information, of a D2D signal, transmitted by the network side in
dedicated signaling.
[0179] Furthermore the transmission resource configuration
information includes at least one of:
[0180] Transmission resource location information, a transmit power
parameter, a transmission period parameter, a parameter of a number
of retransmissions, modulation and coding parameters, and valid
range information of configuration information.
[0181] Furthermore the D2D signal transmitting unit 71 is
configured:
[0182] To generate a D2D signal to be transmitted and to transmit
the generated D2D signal according to the transmission resource
configuration information; or
[0183] To receive a D2D signal transmitted by the network side and
to transmit the received D2D signal according to the transmission
resource configuration information.
[0184] Furthermore the D2D signal includes:
[0185] A specific sequence of an air interface and/or a D2D special
identifier of the first UE.
[0186] Furthermore the D2D special identifier includes identity
information of the first UE and/or service information provided by
the first UE.
[0187] Furthermore the UE further includes:
[0188] A connection releasing unit 72 is configured to release an
RRC connection with the network side after the UE obtains the
transmission resource configuration information of a D2D signal
from the network side and before the UE transmits the D2D signal
according to the transmission resource configuration
information.
[0189] Furthermore the UE further includes:
[0190] A resource releasing unit 73 is configured to release
resources, over which a D2D signal is transmitted, after the D2D
signal is transmitted according to the transmission resource
configuration information.
[0191] Furthermore the resource releasing unit 73 is
configured:
[0192] To release the resources, over which a D2D signal is
transmitted, upon reception of a D2D resource release instruction
or an RRC connection release instruction transmitted by the network
side; or
[0193] To transmit a request to the network side to stop the D2D
signal from being transmitted and to release the resources, over
which a D2D signal is transmitted, upon reception of a D2D resource
release instruction or an RRC connection release instruction
transmitted by the network side; or
[0194] To release the resources, over which a D2D signal is
transmitted, after a period of time T elapses since the
transmission resource configuration information is received, where
T represents the length of valid time of the configuration
information included in the transmission resource configuration
information.
[0195] Furthermore the resource releasing unit 73 is further
configured to establish an RRC connection with the network side, if
the UE is idle, before releasing the resources over which a D2D
signal is transmitted.
[0196] Furthermore the D2D signal transmitting unit 70 is further
configured:
[0197] If the UE is switched to a new cell during transmitting a
D2D signal and is idle or connected while transmitting the D2D
signal, to judge whether the new cell belongs to a valid area,
where the obtained transmission resource configuration information
is applicable, after being switched to the new cell, and if so, to
continue with transmitting the D2D signal according to the
transmission resource configuration information; otherwise, to stop
the D2D signal from being transmitted; or
[0198] If the UE is switched to a new cell while transmitting a D2D
signal and is connected while transmitting the D2D signal, to
continue with transmitting the D2D signal according to new
transmission resource configuration information carried in a
handover command received in the handover procedure after being
switched to the new cell.
[0199] Referring to FIG. 8, another UE according to an embodiment
of the invention includes:
[0200] A configuration information obtaining unit 80 is configured
to obtain reception resource configuration information of a D2D
signal from the network side; and
[0201] A D2D signal searching unit 81 is configured to search for a
D2D signal according to the reception resource configuration
information and to determine a discovery of a first UE transmitting
the D2D signal upon detection of the D2D signal.
[0202] Furthermore the configuration information obtaining unit 80
is configured:
[0203] To transmit a D2D signal reception request to the network
side and to receive the reception resource configuration
information, of a D2D signal, transmitted by the network side in
dedicated signaling; or
[0204] To fetch the reception resource configuration information of
a D2D signal from a system broadcast message transmitted by the
network side.
[0205] Furthermore the reception resource configuration information
includes at least one of:
[0206] Reception resource location information, modulation and
coding parameters, and valid range information of configuration
information.
[0207] Furthermore the D2D signal searching unit 81 is further
configured, upon determining the discovery of the first UE
transmitting the D2D signal,
[0208] To fetch related information of the first UE from the
detected D2D signal;
[0209] And/or
[0210] To transmit an indicator of the detection of the D2D signal
of the first UE to the network side.
[0211] Furthermore the UE further includes:
[0212] A resource releasing unit 82 is configured to release
resources, over which a D2D signal is received, after determining
the discovery of the first UE transmitting the D2D signal.
[0213] Furthermore the resource releasing unit 82 is
configured:
[0214] To release the resources, over which a D2D signal is
received, upon reception of a D2D resource release instruction or
an RRC connection release instruction transmitted by the network
side in dedicated signaling; or
[0215] To transmit a request to the network side to stop the D2D
signal from being received and to release the resources, over which
a D2D signal is received, upon reception of a D2D resource release
instruction or an RRC connection release instruction transmitted by
the network side in dedicated signaling; or
[0216] To release the resources, over which a D2D signal is
received, upon detecting no reception resource configuration
information carried in a system broadcast message; or
[0217] To release the resources, over which a D2D signal is
received, after a period of time T since the reception resource
configuration information is received, where T represents the
length of valid time of the configuration information included in
the reception resource configuration information.
[0218] Furthermore a set of resources, over which a D2D signal is
received, indicated by the reception resource configuration
information, is a set of resources, over which a D2D signal is
transmitted, allocated by the network side or a subset thereof.
[0219] Referring to FIG. 9, a base station according to an
embodiment of the invention includes:
[0220] A first configuring unit 90 is configured to transmit
transmission resource configuration information of a Device to
Device (D2D) signal to a first UE after the first UE establishes a
Radio Resource Control (RRC) connection with the network side, so
that the first UE transmits a D2D signal according to the
transmission resource configuration information; and
[0221] A second configuring unit 91 is configured to transmit
reception resource configuration information of a D2D signal to a
second UE, so that the second UE searches for a D2D signal
transmitted by the first UE according to the reception resource
configuration information.
[0222] Furthermore the first configuring unit 90 is configured:
[0223] To transmit actively the transmission resource configuration
information of a D2D signal to the first UE in dedicated signaling;
or
[0224] To transmit the transmission resource configuration
information of a D2D signal to the first UE in dedicated signaling
upon reception of a D2D signal transmission request transmitted by
the first UE.
[0225] Furthermore the transmission resource configuration
information includes at least one of:
[0226] Transmission resource location information, a transmit power
parameter, a transmission period parameter, a parameter of a number
of retransmissions, modulation and coding parameters, and valid
range information of configuration information.
[0227] Furthermore the first configuring unit 90 is further
configured to transmit to the first UE a D2D signal to be
transmitted by the first UE after the transmission resource
configuration information of a D2D signal is transmitted to the
first UE.
[0228] Furthermore the base station further includes:
[0229] A first releasing unit 92 is configured, after the
transmission resource configuration information of a D2D signal is
transmitted to the first UE, to transmit actively a D2D resource
release instruction or an RRC connection release instruction to the
first UE, to instruct the first UE to release resources over which
a D2D signal is transmitted; or
[0230] To transmit a D2D resource release instruction or an RRC
connection release instruction to the first UE, upon reception of a
request transmitted by the first UE to stop the D2D signal from
being transmitted, to instruct the first UE to release resources
over which a D2D signal is transmitted.
[0231] Furthermore the first configuring unit 90 is configured:
[0232] After the transmission resource configuration information of
a D2D signal is transmitted to the first UE, if the first UE is
switched to a new cell and the first UE is currently connected, to
transmit new transmission resource configuration information to the
first UE in a handover command in the handover procedure of the
first UE, so that the first UE continues with transmitting a D2D
signal according to the new transmission resource configuration
information.
[0233] Furthermore the second configuring unit 92 is
configured:
[0234] To transmit the reception resource configuration information
of a D2D signal to the second UE in dedicated signaling upon
reception of a D2D signal reception request transmitted by the
second UE; or
[0235] To transmit the reception resource configuration information
of a D2D signal to the second UE in a system broadcast message.
[0236] Furthermore the reception resource configuration information
includes at least one of:
[0237] Reception resource location information, modulation and
coding parameters, and valid range information of configuration
information.
[0238] Furthermore the base station further includes:
[0239] A second releasing unit 93 is configured, after the
reception resource configuration information of a D2D signal is
transmitted to the second UE, to transmit actively a D2D resource
release instruction or an RRC connection release instruction to the
second UE in dedicated signaling to instruct the second UE to
release resources over which a D2D signal is received; or
[0240] To transmit a D2D resource release instruction or an RRC
connection release instruction to the second UE in dedicated
signaling, upon reception of a request transmitted by the second UE
to stop the D2D signal from being received, to instruct the second
UE to release resources over which a D2D signal is received.
[0241] Furthermore a set of resources, over which a D2D signal is
received, indicated by the reception resource configuration
information, is a set of resources, over which a D2D signal is
transmitted, allocated by the network side or a subset thereof.
[0242] Referring to FIG. 10 illustrating a UE according to another
embodiment of the invention, the UE is configured to transmit a D2D
signal, so that such UE can be discovered by another UE. The UE can
include a transceiver 101, a processor 102 and a memory 103:
[0243] The processor 102 is configured to obtain transmission
resource configuration information of a Device to Device (D2D)
signal from the network side through the transceiver 101 after the
UE establishes an RRC connection with the network side; to store
the transmission resource configuration information of a D2D signal
in the memory 103; and to transmit a D2D signal through the
transceiver 101 according to the transmission resource
configuration information stored in the memory 103.
[0244] Particularly the transceiver 101 can receive dedicated
signaling transmitted by the network side, and the processor 102
can obtain the transmission resource configuration information of a
D2D signal from the dedicated signaling received by the transceiver
101; or the transceiver 101 can receive dedicated signaling
transmitted by the network side, and the processor 102 can transmit
a D2D signal transmission request to the network side through the
transceiver 101 and obtain the transmission resource configuration
information of a D2D signal from the dedicated signaling received
by the transceiver 101.
[0245] Particularly the processor 102 can generate a D2D signal to
be transmitted and transmit the generated D2D signal through the
transceiver 101 according to the transmission resource
configuration information; or the processor 102 can receive a D2D
signal transmitted in advance by the network side through the
transceiver 101 and transmit the received D2D signal through the
transceiver 101 according to the transmission resource
configuration information.
[0246] Where the D2D signal includes a specific sequence of an air
interface and/or a D2D special identifier of the first UE, and the
D2D special identifier includes identity information of the first
UE and/or service information provided by the first UE.
[0247] Furthermore the processor 102 can further release an RRC
connection with the network side after the transmission resource
configuration information of a D2D signal is obtained from the
network side and before the D2D signal is transmitted according to
the transmission resource configuration information.
[0248] Furthermore the processor 102 can further release resources,
over which a D2D signal is transmitted, after the D2D signal is
transmitted according to the transmission resource configuration
information. Particularly the processor 102 is configured to
release the resources, over which a D2D signal is transmitted, upon
reception through the transceiver 101 of a D2D resource release
instruction or an RRC connection release instruction transmitted by
the network side; or to transmit a request to the network side
through the transceiver 101 to stop the D2D signal from being
transmitted and to release the resources, over which a D2D signal
is transmitted, upon reception through the transceiver 101 of a D2D
resource release instruction or an RRC connection release
instruction transmitted by the network side; or to release the
resources, over which a D2D signal is transmitted, after a period
of time T elapses since the transmission resource configuration
information is received through the transceiver 101, T represents
the length of valid time of the configuration information included
in the transmission resource configuration information.
[0249] Furthermore the processor 102 can be further configured, if
the UE is switched to a new cell during the transceiver 101
transmits a D2D signal, and the UE is idle or connected while the
transceiver 101 transmits the D2D signal, to judge whether the new
cell belongs to a valid area, where the obtained transmission
resource configuration information is applicable, after being
switched to the new cell, and if so, to continue with transmitting
a D2D signal through the transceiver 101 according to the
transmission resource configuration information; otherwise, to stop
the D2D signal from being transmitted through the transceiver 101;
or if the UE is switched to a new cell during the transceiver 101
transmits a D2D signal, and the UE is connected while the
transceiver 101 transmits the D2D signal, to continue with
transmitting a D2D signal through the transceiver 101 according to
new transmission resource configuration information carried in a
handover command received in the handover procedure after being
switched to the new cell.
[0250] In the UE above, the transmission resource configuration
information includes at least one of transmission resource location
information, a transmit power parameter, a transmission period
parameter, a parameter of a number of retransmissions, modulation
and coding parameters, and valid range information of configuration
information.
[0251] Referring to FIG. 11 illustrating a UE according to another
embodiment of the invention, the UE is configured to discover a D2D
signal, and the UE can include a transceiver 111, a processor 112
and a memory 113:
[0252] The processor 112 is configured to obtain reception resource
configuration information of a D2D signal from the network side
through the transceiver 111; to store the obtained reception
resource configuration information in the memory 113; and to search
for a D2D signal through the transceiver 111 according to the
reception resource configuration information stored in the memory
113 and to determine a discovery of a first UE transmitting the D2D
signal upon detection of the D2D signal.
[0253] Particularly the processor 112 can transmit a D2D signal
reception request to the network side through the transceiver 111,
to receive dedicated signaling transmitted by the network side
through the transceiver 111, and to obtain the reception resource
configuration information, of a D2D signal from the dedicated
signaling; or the processor 112 can receive a system broadcast
message from the network side through the transceiver 111 and to
fetch the reception resource configuration information of a D2D
signal from the currently received system broadcast message.
[0254] Particularly the processor 112 can fetch related information
of the first UE from the D2D signal detected by the transceiver
111, and/or to transmit an indicator of the detection of the D2D
signal of the first UE to the network side through the transceiver
111, upon determining the discovery of the first UE transmitting
the D2D signal.
[0255] Furthermore the processor 112 can release resources, over
which a D2D signal is received, after determining the discovery of
the first UE transmitting the D2D signal. Particularly the
processor 112 can receive dedicated signaling transmitted by the
network side through the transceiver 111 and to release the
resources, over which a D2D signal is received, upon reception of a
D2D resource release instruction or an RRC connection release
instruction from the currently received dedicated signaling; or to
transmit a request to the network side through the transceiver 111
to stop the D2D signal from being received and to release the
resources, over which a D2D signal is received, upon reception
through the transceiver 111 of a D2D resource release instruction
or an RRC connection release instruction transmitted by the network
side in dedicated signaling; or to release the resources, over
which a D2D signal is received, upon detecting no reception
resource configuration information carried in a system broadcast
message received through the transceiver 111; or to release the
resources, over which a D2D signal is received, after a period of
time T since the reception resource configuration information is
received through the transceiver 111, T represents the length of
valid time of the configuration information included in the
reception resource configuration information.
[0256] A set of resources, over which a D2D signal is received,
indicated by the reception resource configuration information, is a
set of resources, over which a D2D signal is transmitted, allocated
by the network side or a subset thereof.
[0257] In the UE above, the reception resource configuration
information includes at least one of reception resource location
information, modulation and coding parameters, and valid range
information of configuration information.
[0258] Referring to FIG. 12 illustrating a base station according
to an embodiment of the invention, the base station includes a
transceiver 121 and a processor 122. The processor 122 is
configured to transmit transmission resource configuration
information of a Device to Device (D2D) signal to a first UE
through the transceiver 121 after the first UE establishes an RRC
connection with the network side, so that the first UE transmits a
D2D signal according to the transmission resource configuration
information; and to transmit reception resource configuration
information of a D2D signal to a second UE through the transceiver
121, so that the second UE searches for a D2D signal transmitted by
the first UE according to the reception resource configuration
information.
[0259] Particularly the processor 122 can transmit actively the
transmission resource configuration information of a D2D signal to
the first UE in dedicated signaling through the transceiver 121; or
to transmit the transmission resource configuration information of
a D2D signal to the first UE in dedicated signaling through the
transceiver 121 upon reception through the transceiver 121 of a D2D
signal transmission request transmitted by the first UE.
[0260] Furthermore the processor 122 can further transmit to the
first UE through the transceiver 121 a D2D signal to be transmitted
by the first UE after the transmission resource configuration
information of a D2D signal is transmitted to the first UE through
the transceiver 121.
[0261] Furthermore the processor 122 can further transmit actively
a D2D resource release instruction or an RRC connection release
instruction to the first UE through the transceiver 121, after the
transmission resource configuration information of a D2D signal is
transmitted to the first UE through the transceiver 121, to
instruct the first UE to release resources over which a D2D signal
is transmitted; or to transmit a D2D resource release instruction
or an RRC connection release instruction to the first UE through
the transceiver 121, upon reception through the transceiver 121 of
a request transmitted by the first UE to stop the D2D signal from
being transmitted, to instruct the first UE to release resources
over which a D2D signal is transmitted.
[0262] Furthermore after the transmission resource configuration
information of a D2D signal is transmitted to the first UE through
the transceiver 121, if the first UE is switched to a new cell and
the first UE is currently connected, then the processor 122 can
further transmit new transmission resource configuration
information to the first UE in a handover command through the
transceiver 121 in the handover procedure of the first UE, so that
the first UE continues with transmitting a D2D signal according to
the new transmission resource configuration information.
[0263] Particularly the processor 122 can further transmit the
reception resource configuration information of a D2D signal to the
second UE in dedicated signaling through the transceiver 121 upon
reception through the transceiver 121 of a D2D signal reception
request transmitted by the second UE; or to transmit the reception
resource configuration information of a D2D signal to the second UE
in a system broadcast message through the transceiver 121.
[0264] Furthermore the processor 122 can further transmit actively
a D2D resource release instruction or an RRC connection release
instruction to the second UE in dedicated signaling through the
transceiver 121, after the reception resource configuration
information of a D2D signal is transmitted to the second UE through
the transceiver 121, to instruct the second UE to release resources
over which a D2D signal is received; or to transmit actively a D2D
resource release instruction or an RRC connection release
instruction to the second UE through the transceiver 121 in
dedicated signaling, upon reception through the transceiver 121 of
a request transmitted by the second UE to stop the D2D signal from
being received, to instruct the second UE to release resources over
which a D2D signal is received.
[0265] In the terminal above, a set of resources, over which a D2D
signal is received, indicated by the reception resource
configuration information, is a set of resources, over which a D2D
signal is transmitted, allocated by the network side or a subset
thereof.
[0266] In the terminal above, the transmission resource
configuration information includes at least one of transmission
resource location information, a transmit power parameter, a
transmission period parameter, a parameter of a number of
retransmissions, modulation and coding parameters, and valid range
information of configuration information.
[0267] In the terminal above, the reception resource configuration
information includes at least one of reception resource location
information, modulation and coding parameters, and valid range
information of configuration information.
[0268] In summary, the invention has the following advantageous
effects:
[0269] In the solution according to the embodiments of the
invention, the first UE transmits a D2D signal according to the
transmission resource configuration information, of a D2D signal,
obtained from the network side, and the second UE searches for a
D2D signal according to the reception resource information, of a
D2D signal, obtained from the network side and determines a
discovery of the corresponding first UE upon detection of the D2D
signal. As can be apparent, in this solution, a UE to be
discovered, i.e., the first UE, transmits a D2D signal, a UE
needing to discover another UE, i.e., the second UE, discovers the
first UE by searching for a D2D signal, which addresses the problem
of how to discover each other between the UEs.
[0270] The invention has been described in a flow chart and/or a
block diagram of the method, the device (system) and the computer
program product according to the embodiments of the invention. It
shall be appreciated that respective flows and/or blocks in the
flow chart and/or the block diagram and combinations of the flows
and/or the blocks in the flow chart and/or the block diagram can be
embodied in computer program instructions. These computer program
instructions can be loaded onto a general-purpose computer, a
specific-purpose computer, an embedded processor or a processor of
another programmable data processing device to produce a machine so
that the instructions executed on the computer or the processor of
the other programmable data processing device create means for
performing the functions specified in the flow(s) of the flow chart
and/or the block(s) of the block diagram.
[0271] These computer program instructions can also be stored into
a computer readable memory capable of directing the computer or the
other programmable data processing device to operate in a specific
manner so that the instructions stored in the computer readable
memory create an article of manufacture including instruction means
which perform the functions specified in the flow(s) of the flow
chart and/or the block(s) of the block diagram.
[0272] These computer program instructions can also be loaded onto
the computer or the other programmable data processing device so
that a series of operational steps are performed on the computer or
the other programmable data processing device to create a computer
implemented process so that the instructions executed on the
computer or the other programmable device provide steps for
performing the functions specified in the flow(s) of the flow chart
and/or the block(s) of the block diagram.
[0273] Although the preferred embodiments of the invention have
been described, those skilled in the art benefiting from the
underlying inventive concept can make additional modifications and
variations to these embodiments. Therefore the appended claims are
intended to be construed as encompassing the preferred embodiments
and all the modifications and variations coming into the scope of
the invention.
[0274] Evidently those skilled in the art can make various
modifications and variations to the invention without departing
from the spirit and scope of the invention. Thus the invention is
also intended to encompass these modifications and variations
thereto so long as the modifications and variations come into the
scope of the claims appended to the invention and their
equivalents.
* * * * *